DISTANCE MEASURING DEVICE AND DISTANCE MEASURING METHOD

To provide a distance measuring device and a distance measuring method with which it is possible to reduce the influence of an error included in a transmit signal.SOLUTION: A distance measuring device 100 pertaining to the present invention comprises: a frequency modulation unit 110 for frequency-modulating a carrier wave using a modulating signal and generating a transmit signal; a radar wave transmit-receive unit 120 for transmitting the transmit signal as a radar wave, and receiving a reflected wave of the radar wave having been reflected by a target, as a receive signal; a transmit-receive signal mixing unit 130 for mixing the transmit and receive signals and thereby generating an intermediate signal; a phase difference calculation unit 140 for calculating a phase difference between the (+n)th side wave of the intermediate signal and the (-n)th side wave of the intermediate signal; a reference phase calculation unit 150 for calculating the phase of a reference signal derived by (2n) multiplication of the modulating signal, as a reference phase; and a distance calculation unit 160 for calculating the distance to the target on the basis of a difference between the phase difference and the reference phase.SELECTED DRAWING: Figure 1 【課題】送信信号に含まれる誤差の影響を低減することが可能な測距装置および測距方法を提供する。【解決手段】本発明にかかる測距装置１００は、変調信号を用いて搬送波を周波数変調することにより送信信号を生成する、周波数変調部１１０と、送信信号をレーダー波として送信し、レーダー波が目標で反射された反射波を受信信号として受信する、レーダー波送受信部１２０と、送信信号と受信信号とを混合することにより中間信号を生成する、送受信信号混合部１３０と、中間信号の（＋ｎ）次側波と、中間信号の（−ｎ）次側波と、の位相差を算出する、位相差算出部１４０と、変調信号を（２ｎ）逓倍した基準信号の位相を基準位相として算出する、基準位相算出部１５０と、位相差と基準位相との差分に基づいて、目標との距離を算出する、距離算出部１６０と、を備える。【選択図】図１